Steam has a daily peak userbase of around 33 million users[1]. I haven't been able to find a recent monthly user count, but it's certainly a lot of users. The Steam hardware survey reports over 96% of surveyed users use Windows[2].
Now, we can't say for sure how many of these users primarily use their PC for gaming. But it's probably a lot of them. PC gaming is huge, and it's one of the few areas where a general consumer actually needs a PC, and can't use a phone or tablet.
Now, we can't say for sure how many of these users primarily use their PC for gaming. But it's probably a lot of them. PC gaming is huge, and it's one of the few areas where a general consumer actually needs a PC, and can't use a phone or tablet.
[1]: https://store.steampowered.com/charts/
[2]: https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...